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The recommendations for daily intake vary between 12-15 mg per day for men or 8-12 mg for women, and the UL (tolerable upper intake) is 40 mg. A low dose zinc supplement should be all that is needed to prevent a deficiency, although up to 30 mg is commonly taken with relative safety.
How Much Is Too Much. The RDI for zinc is 11 mg per day for adult men and 9 mg per day for adult women (except pregnant/lactating women, in which case it's 11 and 12 mg per day, respectively). The upper limit for adult men and women is 40 mg/day before it becomes toxic (including pregnant/lactating women).or men, zinc is particularly interesting since it has a direct link to the body's natural testosterone production. This hormone is what makes a man a man in everything from musculature and facial hair to performance in the bedroom.